Add 81/28 and 9/15
1st number: 2 25/28, 2nd number: 9/15
81/28 + 9/15 is 489/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 15 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 28 × 15 = 420,
81/28 = 81 × 15/28 × 15 = 1215/420 - Likewise, for the 2nd fraction, since 15 × 28 = 420,
9/15 = 9 × 28/15 × 28 = 252/420 - Add the two like fractions:
1215/420 + 252/420 = 1215 + 252/420 = 1467/420 - 1467/420 simplified gives 489/140
- So, 81/28 + 9/15 = 489/140
In mixed form: 369/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/28+18/15 81/56+9/15 81/28+9/30 81/28+27/15 81/84+9/15 81/28+9/45 81/28+45/15 81/28+9/75 81/28+63/15